The Tiffen 4x4 Hot Mirror Filter is designed to address IR Pollution in High Definition cameras. Unlike photographic film, the imaging devices in hi-definition cameras are inherently sensitive to infra-red light. Because of this, IR pollution has become a significant issue, particularly for those hi-definition cameras that do not incorporate an internal IR blocker.
To combat this issue, Tiffen has developed a special Hot Mirror filter that completely blocks IR thru the entire spectrum. These Hot Mirror filters are the perfect solution for IR pollution with no appreciable reduction in visible light transmission. These Hot Mirror Filters can be used individually or stacked with IRND Filters.